US3972534A - Device for continuous adjustment of the stylus pressure - Google Patents

Device for continuous adjustment of the stylus pressure Download PDF

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Publication number
US3972534A
US3972534A US05/575,579 US57557975A US3972534A US 3972534 A US3972534 A US 3972534A US 57557975 A US57557975 A US 57557975A US 3972534 A US3972534 A US 3972534A
Authority
US
United States
Prior art keywords
ring
bearing block
axis
carrier
pick
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/575,579
Other languages
English (en)
Inventor
Joachim Tetzner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Philips Corp
Original Assignee
US Philips Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3972534A publication Critical patent/US3972534A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02—Arrangements of heads
    • G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • G11B3/12—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse
    • G11B3/20—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse by elastic means, e.g. spring
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02—Arrangements of heads
    • G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • G11B3/12—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse
    • G11B3/20—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse by elastic means, e.g. spring
    • G11B3/22—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse by elastic means, e.g. spring adjustable

Definitions

  • the invention relates to a device for the continuous adjustment of the vertical stylus pressure in a record player, whose pick-up arm at the end which is remote from the pick-up element is pivotable about a horizontal spindle and whose stylus pressure can be corrected by means of a load spring, whose tensile force is adjustable by transferring its end of attachment at the side of the mounting plate.
  • Such a device for the continuous adjustment of the stylus pressure is known per se.
  • the tension spring which is attached before the pivot of the pick-up arm in this known device is extended by transferring the point of attachment until the stylus pressure has reached the desired value.
  • a drawback of the known device is that when the spring is adjusted the pick-up arm has to be touched, thus applying a disturbing torque about the axis whose pre-loading is to be affected.
  • the pick-up arm is then not freely movable during adjustment of the spring, and by repeatedly releasing the adjusting device and the pick-up arm it should be checked whether the stylus pressure has reached the desired value after previous adjustment.
  • the transferrable suspension end of the load spring is attached to a carrier, which cooperates with a spiral groove or ridge provided at the inner wall of an adjusting ring which is rotatable on the bearing block of the pick-up arm.
  • the lower point of attachment of the spring is moved, so that the tensile force acting on the pick-up arm is varied.
  • the adjustment is highly sensitive, because the length of the groove is great relative to the adjusting height.
  • the carrier is a slide, which is slidable on the bearing block parallel to the axis of said bearing block and which comprises a stud or a groove respectively, which cooperates with the spiral groove or ridge of the ring.
  • a slide can readily be mounted in the bearing block.
  • FIG. 1 shows the adjusting ring of the device according to the invention in a sectional view at I--I in FIG. 2 along the spiral groove
  • FIG. 2 is an elevation of a bearing block of the pick-up arm with a device according to the invention, partly in cross-section at the line II--II in FIG. 3.
  • FIG. 3 is a top view of the bearing block of FIG. 2, partly in cross-section with the pick-up arm removed.
  • the essential part of the device according to the invention is a split adjusting ring 1.
  • said adjusting ring 1 which in the mounted condition is journalled on the bearing block 3 (FIG. 2) of a pick-up arm 5 for manual rotation, a spiral groove 7 is formed.
  • Said spiral groove has for example a length of approximately 240 angular degrees, whose pitch can be selected to suit the designer.
  • the ring is provided with a radial space 9, so that it fits the bearing rod 3 in a slightly resilient fashion.
  • the pick-up arm 5 is journalled in the bearing block by means of a horizontal spindle 11 and intermediate piece 13.
  • the intermediate piece 13 is provided with a hook 15 before the spindle 11, in which a lug 17 of a tension load spring 19 can be attached.
  • the other lug 21 of the load spring is attached to a tag 23 of a slide 25.
  • the slide 25 engages the spiral groove 7 with a stud 27. As shown in FIG. 1, the ends of the spiral groove 7 do not extend as far as the ends of the ring 1, so that the stud cannot be disengaged by turning the ring too far.
  • the slide 25 is movable parallel to the axis of the bearing block in a guide 27 of the bearing block 3.
  • the slide 25 is vertically moved up and down.
  • the load spring becomes shorter or longer respectively and the tensile force increases or decreases respectively.
  • the load at the rear end of the pick-up arm is increased or reduced, thus enabling the stylus pressure to be adjusted.
  • the pick-up arm is not touched, so that a very sensitive adjustment is possible.
  • the sensitivity of the adjustment is further increased in that the travel of the slide 25 is relatively short, whilst the rotating path of the adjusting ring is relatively large.

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  • Machine Tool Copy Controls (AREA)
  • Measuring Fluid Pressure (AREA)
US05/575,579 1974-05-18 1975-05-08 Device for continuous adjustment of the stylus pressure Expired - Lifetime US3972534A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DT2424279 1974-05-18
DE2424279 1974-05-18

Publications (1)

Publication Number Publication Date
US3972534A true US3972534A (en) 1976-08-03

Family

ID=5915962

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/575,579 Expired - Lifetime US3972534A (en) 1974-05-18 1975-05-08 Device for continuous adjustment of the stylus pressure

Country Status (5)

Country Link
US (1) US3972534A (2)
JP (1) JPS50159702A (2)
ES (1) ES437711A1 (2)
FR (1) FR2271629A1 (2)
IT (1) IT1035744B (2)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819088A (en) * 1952-07-16 1958-01-07 Sears Roebuck & Co Tone arm constructions for phonographs
US3649031A (en) * 1970-02-02 1972-03-14 Borg Warner Tone arm assembly
US3779563A (en) * 1972-05-24 1973-12-18 K Irisawa Device for counteracting inside force of pickup arm of record player

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819088A (en) * 1952-07-16 1958-01-07 Sears Roebuck & Co Tone arm constructions for phonographs
US3649031A (en) * 1970-02-02 1972-03-14 Borg Warner Tone arm assembly
US3779563A (en) * 1972-05-24 1973-12-18 K Irisawa Device for counteracting inside force of pickup arm of record player

Also Published As

Publication number Publication date
JPS50159702A (2) 1975-12-24
FR2271629A1 (2) 1975-12-12
IT1035744B (it) 1979-10-20
ES437711A1 (es) 1977-01-16

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